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Wouldn't it be better to add a short comment here explaining the !length case, something along the lines of "A zero length indicates a NULL argument to system(3) ... handled according to POSIX (check if shell exists) even if the system call hasn't been allowed by the user"?
-- Nathan Sidwell :: http://www.codesourcery.com :: CodeSourcery nathan@codesourcery.com :: http://www.planetfall.pwp.blueyonder.co.uk
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